I have a small tank on my property that ducks land on, I see about an average of 13 ducks there in the evening. Would investing in a couple of decoys be worth it or am I good from here? I don't duck hunt a lot.

Sure, put out a half dozen of what ever species your seeing.

I read a magazine article once that said odd numbers of decoys will draw ducks better than even numbers. I never knew ducks could count but just curious if anyone does this. I plan to try it this year as well as only using hen decoys. That farm pond might be the perfect place to try this.

I dont know about any of that. I like to put my decoys out in groups. Like 3-4-5 wigeon to the left the 3-4-5 gadwalls in the middle and then 3-4-5 teal to the right and than 2-3-4 pintail, or mallards, or ringnecks on the far up wind side. All groups separated by 10 yards or so

Are you talking about leaving decoys on your pond all the time? I would not do that.

No, just for when I get out and hunt it in the morning.

I’d buy a half dozen. Would be best if you knew what kind of ducks are there.

How big is your pond?

I do both of these things, odd numbers and set out a few small groups.

Whats the reasoning behind using only hen decoys?

Early season, drakes haven’t developed their colors. They look very similar to hens and the bright colors of a finished out drake may deter those early season birds as they’ve seen similar decoys all the way down.